Scoped monkey-patching of a class
1
I need to patch a class, but want the patch be local to some module(s). In Ruby I would do:
module ArrayExtension
refine Array do
def ===(other)
self.include?(other)
end
end
end
module Foo
using ArrayExtension
def self.foo
case 2
when [1,2] then puts "bingo!"
end
end
end
Foo.foo # => bingo!
puts [1,2] === 2 # => false
Is there something similar in Crystal?
scope crystal-lang refinements
asked Nov 15 '18 at 16:03
WPeN2Ic850EUWPeN2Ic850EU
78318
add a comment |
1
I need to patch a class, but want the patch be local to some module(s). In Ruby I would do:
module ArrayExtension
refine Array do
def ===(other)
self.include?(other)
end
end
end
module Foo
using ArrayExtension
def self.foo
case 2
when [1,2] then puts "bingo!"
end
end
end
Foo.foo # => bingo!
puts [1,2] === 2 # => false
Is there something similar in Crystal?
scope crystal-lang refinements
asked Nov 15 '18 at 16:03
WPeN2Ic850EUWPeN2Ic850EU
78318
1
There's no way to do that in Crystal, there are no refinements.
– asterite
Nov 23 '18 at 19:50
add a comment |
1
1
1
I need to patch a class, but want the patch be local to some module(s). In Ruby I would do:
module ArrayExtension
refine Array do
def ===(other)
self.include?(other)
end
end
end
module Foo
using ArrayExtension
def self.foo
case 2
when [1,2] then puts "bingo!"
end
end
end
Foo.foo # => bingo!
puts [1,2] === 2 # => false
Is there something similar in Crystal?
scope crystal-lang refinements
asked Nov 15 '18 at 16:03
WPeN2Ic850EUWPeN2Ic850EU
78318
I need to patch a class, but want the patch be local to some module(s). In Ruby I would do:
module ArrayExtension
refine Array do
def ===(other)
self.include?(other)
end
end
end
module Foo
using ArrayExtension
def self.foo
case 2
when [1,2] then puts "bingo!"
end
end
end
Foo.foo # => bingo!
puts [1,2] === 2 # => false
Is there something similar in Crystal?
scope crystal-lang refinements
scope crystal-lang refinements
asked Nov 15 '18 at 16:03
WPeN2Ic850EUWPeN2Ic850EU
78318
asked Nov 15 '18 at 16:03
WPeN2Ic850EUWPeN2Ic850EU
78318
asked Nov 15 '18 at 16:03
WPeN2Ic850EUWPeN2Ic850EU
78318
asked Nov 15 '18 at 16:03
WPeN2Ic850EUWPeN2Ic850EU
78318
asked Nov 15 '18 at 16:03
WPeN2Ic850EUWPeN2Ic850EU
78318
78318
1
There's no way to do that in Crystal, there are no refinements.
– asterite
Nov 23 '18 at 19:50
add a comment |
1
There's no way to do that in Crystal, there are no refinements.
– asterite
Nov 23 '18 at 19:50
1
1
There's no way to do that in Crystal, there are no refinements.
– asterite
Nov 23 '18 at 19:50
There's no way to do that in Crystal, there are no refinements.
– asterite
Nov 23 '18 at 19:50
add a comment |
1 Answer
1
active
oldest
votes
3
So to redefine === you just define it again.
module Foo
def ===(other)
self.includes?(other)
end
end
class CustomArray(T) < Array(T)
include Foo
end
custom_array = CustomArray(Int32).new
custom_array << 1
custom_array << 2
puts custom_array === 1 # true
puts custom_array === 2 # true
puts custom_array === 3 # false
answered Nov 18 '18 at 19:37
SamualSamual
8114
1
Thanks, that could be a good workaround.
– WPeN2Ic850EU
Nov 19 '18 at 6:55
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
3
So to redefine === you just define it again.
module Foo
def ===(other)
self.includes?(other)
end
end
class CustomArray(T) < Array(T)
include Foo
end
custom_array = CustomArray(Int32).new
custom_array << 1
custom_array << 2
puts custom_array === 1 # true
puts custom_array === 2 # true
puts custom_array === 3 # false
answered Nov 18 '18 at 19:37
SamualSamual
8114
1
Thanks, that could be a good workaround.
– WPeN2Ic850EU
Nov 19 '18 at 6:55
add a comment |
3
So to redefine === you just define it again.
module Foo
def ===(other)
self.includes?(other)
end
end
class CustomArray(T) < Array(T)
include Foo
end
custom_array = CustomArray(Int32).new
custom_array << 1
custom_array << 2
puts custom_array === 1 # true
puts custom_array === 2 # true
puts custom_array === 3 # false
answered Nov 18 '18 at 19:37
SamualSamual
8114
1
Thanks, that could be a good workaround.
– WPeN2Ic850EU
Nov 19 '18 at 6:55
add a comment |
3
3
3
So to redefine === you just define it again.
module Foo
def ===(other)
self.includes?(other)
end
end
class CustomArray(T) < Array(T)
include Foo
end
custom_array = CustomArray(Int32).new
custom_array << 1
custom_array << 2
puts custom_array === 1 # true
puts custom_array === 2 # true
puts custom_array === 3 # false
answered Nov 18 '18 at 19:37
SamualSamual
8114
So to redefine === you just define it again.
module Foo
def ===(other)
self.includes?(other)
end
end
class CustomArray(T) < Array(T)
include Foo
end
custom_array = CustomArray(Int32).new
custom_array << 1
custom_array << 2
puts custom_array === 1 # true
puts custom_array === 2 # true
puts custom_array === 3 # false
answered Nov 18 '18 at 19:37
SamualSamual
8114
edited Nov 18 '18 at 19:46
answered Nov 18 '18 at 19:37
SamualSamual
8114
answered Nov 18 '18 at 19:37
SamualSamual
8114
answered Nov 18 '18 at 19:37
SamualSamual
8114
8114
1
Thanks, that could be a good workaround.
– WPeN2Ic850EU
Nov 19 '18 at 6:55
add a comment |
1
Thanks, that could be a good workaround.
– WPeN2Ic850EU
Nov 19 '18 at 6:55
1
1
Thanks, that could be a good workaround.
– WPeN2Ic850EU
Nov 19 '18 at 6:55
Thanks, that could be a good workaround.
– WPeN2Ic850EU
Nov 19 '18 at 6:55
add a comment |
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1
There's no way to do that in Crystal, there are no refinements.
– asterite
Nov 23 '18 at 19:50